Masoneilan SVI II AP Installation and Maintenance ... - GE Energy
Masoneilan SVI II AP Installation and Maintenance ... - GE Energy
Masoneilan SVI II AP Installation and Maintenance ... - GE Energy
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Double Acting Positioner<br />
<strong>Installation</strong> <strong>and</strong> Set Up<br />
Double Acting Positioner<br />
The Double Acting (DA) relay has a pair of opposed pneumatic outputs. When Output 1<br />
delivers air to one side of the actuator, Output 2 vents air from the opposite side of the<br />
actuator piston. The volume of air trapped in each determines the position of the<br />
actuator.<br />
The Action (ATO or ATC) is applied with respect to Output 1. When Output 1 is<br />
connected to deliver air to extend the actuator, the action is ATC, on a down-seating<br />
valve.<br />
1. Connect Output 1, labeled (I) to the inlet port of the actuator <strong>and</strong> Output 2<br />
labeled (<strong>II</strong>) to the opposing actuator port (see Figure 44).<br />
2. Connect air supply <strong>and</strong> actuator outputs (1⁄4" NPT). Supply pressure is 25 - 150 psi<br />
(1.7 - 10.3 bar) (172 - 1030 kPa). Minimum tubing diameter 1⁄4" (6 mm x 4 mm).<br />
Output I<br />
Supply<br />
Output <strong>II</strong><br />
Figure 44<br />
Air Ports on Double Acting Positioner<br />
57
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